<template>
  <div class="login">
    <el-container>
      <el-header style="height: 200px;">
        <div style="display: flex; justify-content: start; margin-left: 200px;">
          <div style="marginRight:6px">
            <img src="../assets/images/login_logo.png" alt="logo"/>
          </div>
          <div style="padding-top: 5px;">
          <span
            style="display:block;width: 148px;fontSize:16px;fontWeight:500;color:#ffffff;lineHeight:22px">教育考试院</span>
            <span style="display: block;width: 148px;fontSize: 12px;fontWeight: 400;color: #ffffff;lineHeight: 14px;">Suzhou Central Education Examination Institute</span>
          </div>
        </div>
      </el-header>
      <el-main style="height: 600px;">
        <el-row>
          <el-col :span="14">
            <div style="margin-left: 150px;"><img :src="imageSrc"/></div>
          </el-col>
          <el-col :span="10">
            <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form">
              <h3 class="title">欢迎登录云平台</h3>
              <el-form-item prop="username">
                <el-input v-model="loginForm.username" type="text" auto-complete="off" placeholder="账号">
                  <svg-icon slot="prefix" icon-class="user" class="el-input__icon input-icon"/>
                </el-input>
              </el-form-item>
              <el-form-item prop="password">
                <el-input
                  v-model="loginForm.password"
                  type="password"
                  auto-complete="off"
                  placeholder="密码"
                  @keyup.enter.native="handleLogin"
                >
                  <svg-icon slot="prefix" icon-class="password" class="el-input__icon input-icon"/>
                </el-input>
              </el-form-item>
              <el-form-item prop="code" v-if="captchaOnOff">
                <el-input
                  v-model="loginForm.code"
                  auto-complete="off"
                  placeholder="验证码"
                  style="width: 63%"
                  @keyup.enter.native="handleLogin"
                >
                  <svg-icon slot="prefix" icon-class="validCode" class="el-input__icon input-icon"/>
                </el-input>
                <div class="login-code">
                  <img :src="codeUrl" @click="getCode" class="login-code-img"/>
                </div>
              </el-form-item>
              <el-checkbox v-model="loginForm.rememberMe" style="margin:0px 0px 25px 0px;">记住密码</el-checkbox>
              <el-form-item style="width:100%;">
                <el-button
                  :loading="loading"
                  size="medium"
                  type="primary"
                  style="width:100%;"
                  @click.native.prevent="handleLogin"
                >
                  <span v-if="!loading">登 录</span>
                  <span v-else>登 录 中...</span>
                </el-button>
                <div style="float: right;" v-if="register">
                  <router-link class="link-type" :to="'/register'">立即注册</router-link>
                </div>
              </el-form-item>
            </el-form>
          </el-col>
        </el-row>
      </el-main>
      <el-footer>
        <!--  底部  -->
        <div class="el-login-footer">
          <span>当前系统版本：v0.1.0</span>
        </div>
      </el-footer>
    </el-container>
  </div>
</template>

<script>
import { getCodeImg } from '@/api/login'
import Cookies from 'js-cookie'
import { encrypt, decrypt } from '@/utils/jsencrypt'

export default {
  name: 'Login',
  data() {
    return {
      codeUrl: '',
      cookiePassword: '',
      loginForm: {
        username: '',
        password: '',
        rememberMe: false,
        code: '',
        uuid: ''
      },
      loginRules: {
        username: [
          { required: true, trigger: 'blur', message: '请输入您的账号' }
        ],
        password: [
          { required: true, trigger: 'blur', message: '请输入您的密码' }
        ],
        code: [{ required: true, trigger: 'change', message: '请输入验证码' }]
      },
      loading: false,
      // 验证码开关
      captchaOnOff: true,
      // 注册开关
      register: false,
      redirect: undefined,
      leftImageList: [
        'login_img_cp.png',
        'login_img_ldty.png',
        'login_img_lq.png',
        'login_img_yy.png',
        'login_img_zq.png'
      ],
      imageSrc: require('@/assets/images/login_img_cp.png'),
      imageNum: 0,
      timer: ''
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  created() {
    this.getCode()
    this.getCookie()
    this.timer = setInterval(this.getImgSrc, 5000)
  },
  methods: {
    getImgSrc() {
      let self = this
      if (self.imageNum == self.leftImageList.length - 1) {
        self.imageNum = 0
      }
      self.imageSrc = require('@/assets/images/' + self.leftImageList[self.imageNum])
      self.imageNum = self.imageNum + 1
    },
    getCode() {
      getCodeImg().then(res => {
        this.captchaOnOff = res.captchaOnOff === undefined ? true : res.captchaOnOff
        if (this.captchaOnOff) {
          this.codeUrl = 'data:image/gif;base64,' + res.img
          this.loginForm.uuid = res.uuid
        }
      })
    },
    getCookie() {
      const username = Cookies.get('username')
      const password = Cookies.get('password')
      const rememberMe = Cookies.get('rememberMe')
      this.loginForm = {
        username: username === undefined ? this.loginForm.username : username,
        password: password === undefined ? this.loginForm.password : decrypt(password),
        rememberMe: rememberMe === undefined ? false : Boolean(rememberMe)
      }
    },
    handleLogin() {
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          this.loading = true
          if (this.loginForm.rememberMe) {
            Cookies.set('username', this.loginForm.username, { expires: 30 })
            Cookies.set('password', encrypt(this.loginForm.password), { expires: 30 })
            Cookies.set('rememberMe', this.loginForm.rememberMe, { expires: 30 })
          } else {
            Cookies.remove('username')
            Cookies.remove('password')
            Cookies.remove('rememberMe')
          }
          this.$store.dispatch('Login', this.loginForm).then(() => {
            this.$router.push({ path: this.redirect || '/' }).catch(() => {
            })
          }).catch(() => {
            this.loading = false
            if (this.captchaOnOff) {
              this.getCode()
            }
          })
        }
      })
    }
  }
}
</script>
<style scoped>
.el-header, .el-footer {
  color: #333;
  line-height: 60px;
}

.el-aside {
  background-color: #D3DCE6;
  color: #333;
  text-align: center;
  line-height: 200px;
}


body > .el-container {
  margin-bottom: 40px;
}

.el-container:nth-child(5) .el-aside,
.el-container:nth-child(6) .el-aside {
  line-height: 260px;
}

.el-container:nth-child(7) .el-aside {
  line-height: 320px;
}
</style>
<style rel="stylesheet/scss" lang="scss">
.login {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  background-image: url("../assets/images/login-bgm.png");
  background-size: cover;
}

.title {
  margin: 0px auto 30px auto;
  text-align: center;
  color: #707070;
}

.login-form {
  border-radius: 6px;
  background: #ffffff;
  width: 400px;
  padding: 25px 25px 5px 25px;

  .el-input {
    height: 38px;

    input {
      height: 38px;
    }
  }

  .input-icon {
    height: 39px;
    width: 14px;
    margin-left: 2px;
  }
}

.login-tip {
  font-size: 13px;
  text-align: center;
  color: #bfbfbf;
}

.login-code {
  width: 33%;
  height: 38px;
  float: right;

  img {
    cursor: pointer;
    vertical-align: middle;
  }
}

.el-login-footer {
  height: 40px;
  line-height: 40px;
  position: fixed;
  bottom: 0;
  width: 100%;
  text-align: center;
  color: #fff;
  font-family: Arial;
  font-size: 12px;
  letter-spacing: 1px;
}

.login-code-img {
  height: 38px;
}
</style>
